Polymer Cell Battery Pack to Reduce Heat in Handheld Vacuum Cleaners
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Solution Overview
Problem
Existing handheld separation devices powered by cylindrical battery cells suffer from high internal resistance, leading to excessive heat generation in high-power modes, which degrades user experience.
Innovation Solution
A rechargeable battery pack featuring a polymer cell with a square structure, connected in series, and equipped with a PCM board that includes a power management chip and a peripheral balancing circuit to manage voltage differences and balance power among cell units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cylindrical battery cells are used in handheld separation devices, then the battery structure is simple and easy to manufacture, but the internal resistance is relatively large and generates a great amount of heat in high-power mode
Solution Approach 1:
The patent changes the battery cell shape parameter from cylindrical to square/polymer structure. This parameter change reduces the internal resistance of the battery cell, thereby reducing heat generation during high-power operation while maintaining ease of manufacture through standardized polymer cell production processes.
2Ease of manufacture
If cylindrical battery cells are used in handheld separation devices, then the manufacturing process is straightforward, but the heat generation degrades user experience
Solution Approach 1:
The patent changes the battery cell shape parameter from cylindrical to square/polymer structure. This parameter change reduces the internal resistance of the battery cell, thereby reducing heat generation during high-power operation and improving user experience while maintaining ease of manufacture through standardized polymer cell production processes.
3Power
If multiple polymer cell units are connected in series to increase voltage, then the power output is improved, but the voltage difference between cell units increases requiring balancing circuits
Solution Approach 1:
The patent implements a voltage balancing circuit with feedback control that continuously monitors the voltage of each polymer cell unit and actively balances them by redirecting current from higher-voltage cells to lower-voltage cells. This feedback mechanism maintains voltage equilibrium across series-connected cells, enabling high power output while managing the complexity through intelligent control.
4Reliability
If a PCM board with power management chip and balancing circuit is added, then the voltage balancing and power management are improved, but the device complexity increases
Solution Approach 1:
The patent introduces a PCM board with power management chip as an intermediary component that centralizes the control functions for voltage balancing and power management. This intermediary integrates multiple control functions into a single dedicated module, improving reliability through specialized control while managing overall system complexity through functional integration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polymer cell with lower internal resistance generates less heat during large-current discharging, enhancing user experience and extending the service life of the battery pack.
Implementation Method 1
The cylindrical battery cells have relatively large internal resistance and generate a great amount of heat in high-power mode
Data Source
AI summary
The disclosure provides a rechargeable battery pack, applicable to a handheld vacuum cleaner, including: a polymer cell, comprising at least one polymer cell unit; a charger input terminal, electrically connected to the polymer cell, wherein the polymer cell is charged through the charger input terminal; a power interface, electrically connected to the polymer cell, and configured to supply power to the handheld vacuum cleaner when the rechargeable battery pack is connected to the handheld vacuum cleaner; and a protective circuit module (PCM) board. A handheld vacuum cleaner is further provided herein.